Like one of the guys before me, I'm also curious as to what you used to make this. I've submitted a bunch of stuff on the audio portal, most of which was terrible because of how limiting some programs can be (like Mixman Studio Pro). I've started to tinker with Acid, and I'm having fun with that, but I always like to know about other quality programs that are out there. Shoot me a response, and keep up the great work!